A case clamp (20) for clamping carcass parts to furniture carcasses, such as tail cupboards, top or bottom cupboards, having a base frame (1), a lower compression beam (1′) provided on the base frame (1), at least two supports (2, 3) disposed on the base frame (1), of which at least one is traversable horizontally on the base frame (1), at least two pairs of horizontal compression beams (6, 7) disposed on the supports (2, 3) so as to be horizontally traversable, and an upper compression beam (4) disposed on the supports (2, 3) so as to be vertically traversable, wherein in each case the supports (2, 3) are supported exclusively on the base frame (1) in the vertical direction at least and are free at the opposing end (2′, 3′).